Freshwater

Common nase

Chondrostoma nasus

A swift river fish with a unique mouth structure, known for its schooling behavior and specific …

Constancia’s seasonal killifish

Cynolebias constanciae

The body of Constancia's seasonal killifish (Cynolebias constanciae) is elongate and slightly laterally compressed.

Dace

Rhinichthys cataractae

Dace have a slender body. Most species have terminal antennae. The pearl dace (Semotilus margarita margarita) …

Dace, Longnose

Rhinichthys cataractae

The longnose dace is a distinctive minnow with a long, fleshy snout, a subterranean mouth and …

Drum, Freshwater

Aplodinotus grunniens

The body is deep, with a crooked back, a blunt snout and a subterranean mouth adapted …

Eastern bottle-nosed mormyrid

Mormyrus longirostris

The eastern bottle-nosed mormyrid has such a distinctive appearance that it cannot be confused with any …

Eel, American

Anguilla rostrata

The body is elongated and snake-like, with a pointed head and many teeth. It is covered …

Fahaka pufferfish

Tetraodon lineatus

The skin of the Fahaka pufferfish is scaleless, but the head and body are covered with …

Finescaled four-eyed fish

Anableps microlepis

Anableps: Greek, ana = up + Greek, blepo, blepsis, -eos = glance, sight.The elongated cylindrical body …

Fourspine stickleback

Apeltes quadracus

The fourspine stickleback possesses an elongated, fusiform body lacking scales. Typically, it exhibits four or five …

Frankfish

Gymnarchus niloticus

The Frankfish has a long and slender body. It possesses four small bony gills on both …

Green pufferfish

Dichotomyctere fluviatilis

The body of the green pufferfish is short and rounded, with bulging eyes and a very …

Green terror

Andinoacara rivulatus, syn. Aequidens rivulatus.

The Green Terror is a stocky fish with a prominent forehead. In adult males, a pronounced …

Hogsucker, Northern

Hypentelium nigricans

The Northern Hogsucker gets its name from its pig-like appearance, especially its head. It has a …

Honey sucker

Gyrinocheilus aymonieri

The scientific name was given in honour of the French linguist and explorer Étienne Aymonier (1844-1929).The …

Humpback whitefish

Coregonus pidschian

The body of the humpback whitefish becomes more pronounced with age, growing taller. A well-defined hump …

Madtom, Brown

Noturus phaeus

Brown madtom has a dull coloration. The upper part of the body has a chocolate brown …

Madtoms: Black Madtom

Noturus funebris

The madtom is recognized by its unique fleshy fin. In non-madtom catfish, the fat fin protrudes …

Mbu pufferfish

Tetraodon mbu

The Mbu pufferfish is the largest representative of the pufferfish family in the world. It is …

New Zealand longfin eel

Anguilla dieffenbachii

The New Zealand longfin eel possesses a long, slender body with a large mouth filled with …

Pallid sturgeon

Scaphirhynchus albus

The pallid sturgeon has a distinctive, prehistoric appearance. Its body is elongated, nearly cylindrical, with a …

Peled

Coregonus peled

The peled can be easily distinguished from other whitefish by its terminal mouth, in which the …

Scaly osman

Diptychus maculatus

The body of the Scaly osman is fusiform (spindle-shaped), elongate, and shallow. The mouth is inferior …

Siberian sturgeon

Huso baerii

The Siberian sturgeon has a spindle-shaped body with several longitudinal rows of bumps. Its short, triangular …